\editionMod answers 1 1/4 staffA.Voice \hideall
\editionMod answers 1 2/4 staffB.Voice \hideall
\editionMod answers 3 0/4 staffB.Voice \showall

\score {
  \new StaffGroup <<
    \new Staff \with { \editionID staffA }
    \relative c' {
      c4 d e f |
      g a b c8 b |
      a g f e d4 e8 d |
      c1 |
    }
    \new Staff \with { \editionID staffB }
    \relative c' {
      \clef bass
      c,4 b a g8 f |
      e4 d8 c a4 g |
      a b8 c d4 a |
      c1 |
    }
  >>
  \layout { }
  \midi { }
}
